Multiple twisting frame fitted with permanent magnets



G. FRANZEN Feb. 13, 1968 MULTIPLE TWISTING FRAME FITTED WITH PERMANENTMAGNETS 2 Sheets-Sheet l Filed March 1, 1966 jm/emor:

MULTIPLE TWISTING FRAME FITTED WITH PERMANENT MAGNETS Feb. 13, 1968Filed March' 1',

United States Patent Cfiflce 3,368,337 Patented Feb. 13, 1968 11 Claims.(oi. 57-5836) The invention relates to a multiple twisting frame fittedwith permanent magnets for locating the pots of the winding-off bobbins.

In such twisting frames it is the practice to interpose separatorsbetween the several spindles for the purpose of preventing yarn breakageon any one of the spindles from interfering with the draw-off of theyarn from the other spindles. Balloon limiters are also often providedto limit the diameter of the balloon formed by the running yarn.

It has already been proposed to mount magnets on special holders betweenthe spindles for locating the pots of winding-off bobbins, but thisexpedient increases the spacing of the spindles on the frame. Moreover,the holders collect dust and the running yarn may come into contact withthe holders.

For conveniently accommodating all the necessary parts including themagnets without increasing the spindle spacing and without the necessityof having to use rather small winding-off bobbins, it has further beenproposed to provide magnet holders at the back of the machine. This isnot very advantageous because the holders are relatively troublesome tosecure and their inaccessibility encourages the accumulation of dirt.MoreoverQthe presence of the magnets at the back subjects the spindlehearings to a one-sided load, which tends to cause premature wear of thespindle.

It is the object of the invention to accommodate the magnets in thedivision between the spindles in such a way that they are functionallyintegrated with another important part of the machine, namely theseparator between the spindles, that they are substantially hidden,cannot collect dust and will not cause the spindle hearings to beexposed to unbalanced loads. This will apply more particularly when acylindrical balloon limiter cannot be used.

The invention consists of a multiple twisting frame, comprising aspindle bench, twist spindles together with associated pots mounted onsaid spindle bench, the walls of the said pots containing permanentmagnets in diametrically opposed relationship, separators for the saidspindles, each separator being mounted on the said spindle bench betweenadjacent pots, the said separators carrying a permanent magnetpositioned therein to act on the permanent magnets in the walls ofadjacent pots. The separator may, if required, carry connecting meansfor balloon limiters, e.g. holders therefor, in which instance theconnecting means, e.g. holders, are preferably located in theneighbourhood of the magnets in the pots.

The foot portions of neighbouring separators are preferably so designedthat they form a cover for the belt and, if desired, inter-mediatemembers may be provided between each two foot portions, which may formpart of the cover, and which also may contain control elements, forinstance for the brakes of the spindles. Furthermore, the intermediatemembers may be hinged and thus arranged themselves to control thespindle brakes.

The permanent magnets which are interposed between each two spindles andwhich act in both directions first and foremost ensure that the magneticforces will not impose unbalanced' loads on the spindle bearings.Moreover, the magnets form a row lengthwise of the machine and thischain of magnets in conjunction with their concave shape on each sideprovides a particularly reliable means for locating the individual pots,while permitting them to be spaced very closely together. At the sametime the magnets and their support means are located so that they do notobstruct any work that has to be done at the spindles. They also offerno opportunities for the accumulation of dirt or for the ballooning yarnto get caught and they require no special support means. Specialbrackets are always undesirable because they must be specially affixedeither concentrically to the spindle on the spindle bench or further tothe back to the machine frame. In the case of swivel-mounted spindlesthe magnets are held by a special bracket on the swivel ar-m.

If the magnet has only one pole on each side thereof, the pot will beretained in the correct position whichever way round it may have beeninserted, in other words the pot will always point forwards to permitparts to be checked which can only be checked if the pots are always inthe same unchanged position. Magnetisation of the permanent magnets toform poles of alternately opposite polarities provides a particularlypowerful retaining force permitting the gap widths between the separatorand the pots to be of substantial width, a matter of imporance whenballoon limiters are absent.

A considerable and desirable saving in space will also result if,according to a preferred feature of the invention, the permanent magnetsare located at a mid-portion of the pot walls, e.g. about half way upthe sides of the protective pots. This permits the winding-off bobbin tobe mounted at a lower elevational level on the spindle axis, resultingin a compact form of construction in which the balloons are squat sothat the draw-oif speed of very fine and delicate yarns can beincreased.

Preferred embodiments of the invention are hereinafter described andillustrated in the accompanying drawings, in which:

FIGURE 1 is a fragmentary perspective view of part of a multipletwisting frame with spindles without balloon limiters,

FIGURES la and 1b illustrate details of the arrangement according toFIGURE 1,

FIGURE 2 is a horizontal section of the arrangement according to FIGURE1, and

FIGURE 3 is a perspective view of a portion of a multiple twisting framewith balloon limiters.

Referring to the drawings, double twist spindles are mounted inconventional manner on a spindle bench 1. FIGURE 1 shows two suchspindles 2. In FIGURES l and 3, only separators intervene betweenneighbouring spindles 2, balloon limiters not being provided in thisinstance.

The separators 3 according to the invention are formed with a footportion 4 by means of which they are mounted on the spindle bench 1.Permanent magnets 6 of a shape illustrated in FIGURE 10 are insertedinto each of the separators 3.

The permanent magnets may be simply inserted into the separators 3 asindicated in FIGURE 1. Alternatively, the separators may be providedwith special pockets formed as illustrated in section in FIGURE 2. Thepockets 7 completely contain the magnets 6 which fit flush into anopening 5 in each separator 3. Another particularly convenient way ofaccommodating the magnets is to encase them directly in the separator 3if these are produced in the form of castings.

Preferably each magnet 6 is magnetised as indicated in FIGURE 2 withpoles of opposite polarity on each of its magnetic-ally active sides.Naturally this does not preclude forming a single pole on each side.Each magnet 6 exerts an effect on each side thereof, as will be readilyunderstood for instance from FIGURE 2. Each active side of the magnetco-operates with a magnet 8 in the protective pot 9 of the spindle. Eachpot 9 contains two magnets 8 on diametrically opposite sides.

On the inside of the protective pot 9 the magnets are covered by aprotecting ring 10. In the protecting ring which may consist preferablyof aluminum or a light metal alloy, openings containing soft iron yokes11 are provided where the magnets are located. Owing to the metal alloy,openings disposition of the magnets 8 the forces due to the pull of themagnets affecting the bearings of the protective pot 9 in the rotarypart 12 of the spindle are balanced. A form of magnetisation providingseveral poles of opposite polarity on each side permits the air gap S tobe relatively wide, an advantage if twisting proceeds without a balloonlimiter.

If the permanent magnets 6 and their co-operating magnets 8 are notformed with several poles of alternately opposite polarity asillustrated in FIGURE 2, but with only one pole, then the magnets willoperate to retain the pot 9 in one particular position, irrespective ofthe position in which the pot is inserted. A particular side of the potcan then be made always to face forwards, permitting parts to be checkedwhich require all the pots to face the same way to permit the check tobe made. This is an advantage for instance when multistage yarn brakesare fitted, in the case of which the position of the brake is indicatedby marks. The marks will then always be visible at the same place and nospecial manipulations thus needed.

Whereas the arrangement in FIGURE 1 illustrates double twist spindles 2without balloon limiters, FIGURE 3 illustrates a spindle 2 fitted with aballoon limiter 13. This balloon limiter 13 is provided with holders 14for attaching the same to the separators 3, the arrangement being suchthat the holders 14 are insertable into corresponding fittings on theseparators 3. The brackets 14 are located roughly where the permanentmagnets 6 are contained in the separators 3.

The foot portions 4 of the separators 3 form a protective cover for thebelt, and the cover may be formed continuously by the provision ofsuitably shaped intermediate members permanently inserted between eachof two neighbouring feet 4 or an intermediate member may be providedwhich, as indicated at 15, is hingeably openable by operation of hingepins 16 and holes 17, which further allows for the insertion of theparts 15. By arranging the intermediate members to be hingeably opened,ready accessibility is assured, and further, hinged intermediate membersmay be used for operating the spindle brakes.

In the illustrated embodiments the magnets 6 which exert their effect inopposite directions are mounted about half way up the height of thespindles 2. This arrangement has proved to be particularly usefulbecause it permits the bobbin 18 to be lowered in its protective pot 9down the spindle axis by the additional amount formerly needed for theaccommodation of the magnets at the bottom of the protective pot in theconventional form of construction, thus providing the previouslymentioned advantage of the invention, and which substantially Widens therange of applicability and efficiency of the spindles. The magnetsplaced half way up the side of the pot 9 are located in the embodimentillustrated, in that region where the shape of the balloon formed by theyarn ensures that the yarn will not touch either the pot 9 or themagnets 6 on the outside. However, the magnets 6 could be located in theseparators 3 at some other level, in which case the co-operating magnetsin the protective pots 9 would have to be placed at the same level.

If desired, a soft-iron pole piece may be placed in the separatorinstead of the permanent magnet as hereinbefore described. Alternativelysoft-iron pole pieces may be placed in the pots instead of the permanentmagnets as hereinbefore described.

What is claimed is:

1. A multiple twisting frame, comprising a spindle bench, twist spindlestogether with associated pots mounted on said spindle bench, the wallsof the said pots containing permanent magnets in diametrically opposedrelationship; separators for the said spindles, each separator beingmounted on the said spindle bench between adjacent pots, the saidseparators carrying a permanent magnet positioned therein to act on thepermanent magnets in the walls of adjacent pots.

2. A multiple twisting frame according to claim 1, in which thepermanent magnets in the pots are positioned in a mid-portion of thewalls thereof.

3. A multiple twisting frame according to claim 1, in which thepermanent magnets in the pot walls are magnetized to provide a pluralityof poles of alternately differing polarities, and the permanent magnetsin the separator walls are correspondingly magnetized.

4. A multiple twisting frame according to claim 1, in which theseparators have connecting means for connecting the separtors to balloonlimiters.

5. A multiple twisting frame according to claim 4, in which the saidconnecting means are located in the region of the permanent magnets inthe separators.

6. A multiple twisting frame as claimed in claim 1, in which theseparators have foot portions shaped to provide a protective cover for adriving belt for the spindles.

7. A multiple twisting frame as claimed in claim 6, in whichintermediate members are provided between adjacent said foot portions toprovide a continuous protective cover for the said belt.

8. A multiple twisting frame as claimed in claim 1, comprising aplurality of pots containing permanent magnets positioned in amid-portion of the walls thereof, the said permanent magnets being ofsuch strength as to act in both directions to exert a balanced force onthe spindle in each pot.

9. A modification of a multiple twisting frame as claimed in claim 1, inwhich a soft-iron pole piece is placed in the separators, instead of thepermanent magnet.

10. A modification of a multiple twisting frame as claimed in claim 1,in which soft-iron pole pieces are placed in the pot walls, instead ofthe permanent magnets.

11. Each and every novel feature hereinbefore described.

References Cited UNITED STATES PATENTS 1,526,225 2/1925 Kosken 57108 XR2,563,641 '8/1951 Colombu et al. 5758.76 XR 2,715,308 8/1955 Soussloffet al. 5758.76 XR 2,803,939 8/1957 Steele 5758.76 XR 2,811,825 11/1957Cumberworth 57108 3,153,894 8/1964 Kreuschmer 5758.76 3,159,962 12/1964Franzen 5758.76 XR 3,177,643 4/1965 Halleux et al 5758.76 3,264,8128/1966 Scragg 5758.76 3,264,813 8/1966 Mackie 5758.76 3,299,624 1/1967Nimtz 57108 FOREIGN PATENTS 1,029,008 5/1966 Great Britain.

FRANK I. COHEN, Primary Examiner.

D. E. WATKINS, Examiner,

1. A MULTIPLE TWISTING FRAME, COMPRISING A SPINDLE BENCH, TWIST SPINDLESTOGETHER WITH ASSOCIATED POTS MOUNTED ON SAID SPINDLE BENCH, THE WALLSOF THE SAID POTS CONTAINING PERMANENT MAGNETS IN DIMETRICALLY OPPOSEDRELATIONSHIP; SEPARATORS FOR THE SAID SPINDLES, EACH SEPARATOR BEINGMOUNTED ON THE SAID SPINDLE BENCH BETWEEN ADJACENT POTS, THE SAIDSEPARATORS CARRYING A PERMANENT MAGNET POSITION THEREIN TO ACT ON THEPERMANENT MAGNETS IN THE WALLS OF ADJACENT POTS.